hibernate/hibernate-orm · error · UnsupportedOperationException

"Dialect does not support aggregateComponentAssignmentExpres

Error message

"Dialect does not support aggregateComponentAssignmentExpression: " + getClass().getName()

What it means

Error ""Dialect does not support aggregateComponentAssignmentExpression: " + getClass().getName()" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/dialect/aggregate/AggregateSupportImpl.java:46

	@Override
	public String aggregateComponentCustomReadExpression(
			String template,
			String placeholder,
			String aggregateParentReadExpression,
			String columnExpression,
			int aggregateColumnTypeCode,
			SqlTypedMapping column,
			TypeConfiguration typeConfiguration) {
		throw new UnsupportedOperationException( "Dialect does not support aggregateComponentCustomReadExpression: " + getClass().getName() );
	}

	@Override
	public String aggregateComponentAssignmentExpression(
			String aggregateParentAssignmentExpression,
			String columnExpression,
			int aggregateColumnTypeCode,
			Column column) {
		throw new UnsupportedOperationException( "Dialect does not support aggregateComponentAssignmentExpression: " + getClass().getName() );
	}

	@Override
	public String aggregateCustomWriteExpression(
			AggregateColumn aggregateColumn,
			List<Column> aggregatedColumns) {
		return null;
	}

	@Override
	public boolean requiresAggregateCustomWriteExpressionRenderer(int aggregateSqlTypeCode) {
		throw new UnsupportedOperationException( "Dialect does not support requiresAggregateCustomWriteExpressionRenderer: " + getClass().getName() );
	}

	@Override
	public boolean preferSelectAggregateMapping(int aggregateSqlTypeCode) {
		// By default, assume the driver supports this and prefer selecting the aggregate column
		return true;

View on GitHub (pinned to fad1729dce)

Solutions

1. Use a dialect with aggregate support.
2. Map the component as a plain embeddable instead of an aggregate type.

When it happens

Trigger: Triggered when the application calls a Hibernate dialect feature that the configured database dialect cannot provide: Dialect does not support aggregateComponentAssignmentExpression.

Common situations: Common when running against a database whose dialect lacks this capability, when a mapping or HQL/Criteria query requests unsupported functionality, or when the wrong dialect is configured for the database in use. Error: Dialect does not support aggregateComponentAssignmentExpression.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/bcccc24f57a78c34. Report an issue: GitHub.